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BabaBlast [244]
3 years ago
11

The mean of 15 numbers is 12. An extra number is included and the mean increases to 13. What the extra number?

Mathematics
1 answer:
Studentka2010 [4]3 years ago
5 0

Answer: 28

Step-by-step explanation:

The mean of 15 numbers = 12

Then , the sum of the numbers = 12x15 = 180

Let the extra number included be x , then

The new sum = x + 180

And the new total number will increase from 15 to 16

new mean = 13 , so we have :

\frac{x+180}{16} = 13

x+ 180 = 16(13)

x + 180 = 208

x = 208 - 180

x = 28

therefore , the extra number is 28

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Answer:

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Step-by-step explanation:

The two column proof is presented as follows;

Statement {}                   Reason

ABCD is a trapezoid {}  Given

\overline {BA} \cong \overline {CD}  {}                   Given

\overline {BC} \parallel \overline {AD}   {}                   Definition of a trapezoid

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SAS; Side Angle Side rule of congruency

8 0
3 years ago
Read 2 more answers
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